# [Tutor] Could I have used time or datetime modules here?

Dick Moores rdm at rcblue.com
Sun Dec 5 21:03:10 CET 2004

```Thanks, Brian. I looked at your code a long time, and also read the 11/26
thread you started. I can see how I could use datetime() and your t2 - t1
to get the seconds for time.sleep(), but  the resulting code I have in
mind is more convoluted than the heart of my timer3.py, which I quote
below.  (I don't need the alarm time to be more than 24 hours from
current time--therefore I want to ignore the year, month, and day.)

=======================================
import time

alarm = raw_input("Enter alarm time as hhmm: ")

now = time.strftime("%X")  # produces current time in format  hh:mm:ss
nowSecond = int(now[6:])
nowMinute = int(now[3:5])
nowHour = int(now[0:2])

alarmMinute = int(alarm[2:4])
alarmHour = int(alarm[0:2])

hoursDiff = alarmHour - nowHour
minutesDiff = alarmMinute - nowMinute

if hoursDiff < 0 or (hoursDiff == 0 and minutesDiff <= 0):
hoursDiff = hoursDiff + 24 # add a day

sleepSeconds = hoursDiff*3600 + minutesDiff*60 - nowSecond

time.sleep(sleepSeconds)
====================================
If I'm wrong, could someone please set me right?

Dick

Brian van den Broek wrote at 09:54 12/5/2004:
>Dick Moores said unto the world upon 2004-12-05 11:17:
>>I'm wondering if my timer3.py could have been written more simply and
>>easily by using the time or datetime modules to get the number of
>>seconds separating the time now and the time to which the alarm is set.
>>IOW, is there an easier way to calculate the time difference between
>>the time now, say 08:51 and say, tomorrow at 03:45, to take an example
>>of the most difficult case?
>>See timer3.py at
>><http://www.rcblue.com/Python/timer3_ForWeb.py>
>>Thanks, tutors.
>>Dick Moores
>>rdm at rcblue.com
>
>Hi Dick and all,
>
>as you may recall, it was a week or so ago that I was show how to use
>datetime, so I'd be cautious about using my suggestion without testing :-)
>
>But, does this do what is wanted?
>
><code with Python 2.4>
>import datetime
>
>def dif_in_seconds(dif):
>     return dif.days * (24 * 60 * 60) + dif.seconds
>
>t1 = datetime.datetime(2004, 12, 5, 8, 51, 00)
>t2 = datetime.datetime(2004, 12, 6, 15, 45, 00)
>dif = t2 - t1
>
>seconds_dif = dif_in_seconds(dif)
>print seconds_dif
></code>
>
>with output
>
> >>>
>111240
>